<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
		<style>
			*{
				margin: 0;
				padding: 0;
			}
			body{
				/* 2*left + right */
				min-width: 600px;
			}
			div{
				height: 100px;
			}
			.left,
			.right{
				width: 200px;
				background-color: pink;
			}
			.left{
				float: left;
			}
			.right{
				float: right;
			}
			.middle{
				background-color: deeppink;
			}
		</style>
	</head>
	<body>
		<!--
			1.两边固定，中间自适应
			2.当中列要完整显示
			3.当中列要优先加载
		-->
		<div class="middle">middle</div>
		<div class="left">left</div>
		<div class="right">right</div>
	</body>
</html>
